Help with Codes - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

toehead93 · 07-20-2010, 05:15 PM

My CEL came on today. I scanned the codes and cam up with these.
P0420-Catalyst system efficiency below threshold Bank 1
P0430-Catalyst system efficiency below threshold Bank 2
P1133-Bank 1 Fuel control shifted lean (FAOSC) (see pg. 2096)
P1153-Bank 2 Fuel control shifted lean (FAOSC) (see pg. 2098)

I have LT headers and a tune. What would cause this? I thought maybe a bad O2 sensor, but both banks are bad. I lowered the car and recently rubbed the exhaust on a speed bump. I think this may be th ecause but what component is the issue? It doesn't sound like there are any exhaust leaks. Thanks.

busaboy · 07-21-2010, 10:17 PM

With both banks showing a problem it has to be system wide. Something that will effect the engine as a whole. I do wonder if you may have a slight exhaust leak.
I have seen exhaust leaks that will make very little noise and will draw air into the exhaust throwing the computer off.
How long have you driven the car after the tune? Who did the tune?

07-20-2010, 05:15 PM	#1
toehead93 Drives: 2014 2SS/1LE Join Date: Feb 2007 Location: wpb fl Posts: 3,136 View My Garage	Help with Codes My CEL came on today. I scanned the codes and cam up with these. P0420-Catalyst system efficiency below threshold Bank 1 P0430-Catalyst system efficiency below threshold Bank 2 P1133-Bank 1 Fuel control shifted lean (FAOSC) (see pg. 2096) P1153-Bank 2 Fuel control shifted lean (FAOSC) (see pg. 2098) I have LT headers and a tune. What would cause this? I thought maybe a bad O2 sensor, but both banks are bad. I lowered the car and recently rubbed the exhaust on a speed bump. I think this may be th ecause but what component is the issue? It doesn't sound like there are any exhaust leaks. Thanks. __________________ Used Racing Brake 2 Peice Rotors for sale: http://www.camaro5.com/forums/showthread.php?t=344754 Summit White 2014 2SS 1LE Recaros, NPP exhaust, Nav 2010 2SS A6 - sold.

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07-21-2010, 10:17 PM	#2
busaboy Drives: Black RS/SS M6 Join Date: Jun 2009 Location: TX Posts: 233	With both banks showing a problem it has to be system wide. Something that will effect the engine as a whole. I do wonder if you may have a slight exhaust leak. I have seen exhaust leaks that will make very little noise and will draw air into the exhaust throwing the computer off. How long have you driven the car after the tune? Who did the tune?